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Component Weight Arm
2
Moment
Basic Engine
1
223.00 14.50 3,233.50
Add Oil Filter 1.39 29.30 40.73
Add the Starter 7.85 4.97 39.01
Add the Alternator 5.50 4.97 27.34
MA4-SPA Carburetor 3.50 18.80 65.80
Ignition Harness 1.50 14.30 21.45
Spark Plugs 1.32 13.98 18.45
Coils + Bracket + Hardware 1.75 12.48 21.84
Starter Ring Gear and Support 5.50 1.90 10.45
Total Weight and Moment 251.3 3,478.57
Weight
1 Basic Engine Configuration:
• Cub Crafters oil sump and induction tubes
• Hollow front main crankshaft with plug for fixed pitch propeller
* Starter ring gear and support, caburetor, magnetos, ignition system and spark plugs not included.
The plasma II is not included because it is installed on the airframe.
2 Arm Datum is the front of the propeller ring gear support.
Method for Computing Engine Weight and Center of Gravity:
1 Start with basic engine weight and moment.
2 Add or subtract weight and moment of components added or removed.
3 The new total moment is divided by the new total weight to establish the new
complete engine center of gravity.
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